Manhole frame and cover



P 1933- D. c. MULVIVHILL 1,926,595

MANHOLE FRAME AND COVER Filed Jan. 7. 1932 3: J J fl Q 27 O O O O 25 O O O O 29 -I O o O O 0 o Q O O F E 0 O 0 *5/ O Patentedisept. 12 1933 I Enema 0. Mlilvihill, nanniba Mm, assignor m I t; HannibaLCarWheel &1Foundry, Company i I Hannibal, M0.,a corporation; of Missouri rrms invention" relatesjto a closure and a frame therefor, adapted to besused'on a manfhole, cis- V tern or the like; and'the principal object of the V lustrating a preierredembodiment pf zthe inven" invention. is to provide a cover thatean be re-- 2 movedor pla'ced invposition with great ease andv that will remain firmly seatedand securely looked they frame whenit has-once been placed thereupon.

7 Further objects and advantages of inv'e n-f; tion will V be revealed as a the disclosure is read in connection with the accompanying--drawing, i1

tion, in which t h flam "Fig- 2 "is a vertical sectiontaken on line-2+2 Fig.,3qis ;a vertical section taken "011 1 1116 3 3 Fig.4 isaplan-viewofthelframeg- Fig. 5 is a plan viewof g It will beunderstood that' the gist ofntheinvention canbe embodied in other. forms than that .scope of the claims.

r of the mane-hole or pit v are constructed? -gin its diselosed herein, whiclii-shoul d fall within, the

The frame leis surrounded by the concrete" fmaso'nryor other material-ll .of w'hich'the Wall's general'form the fi'ame'resembles -an angle ring;

it has'a cylindricalbody portion12gequipped with, anoutwardly-disiaosed flange 13 around its lower 1; edga imbedded in the material of the wall 11; a

Extending around the insideof the cylindrical bodyfportion l2 is the interior flange i i; along.

the upper surface of whichadj acent the body; portion 12;is a gr0ove -151In order that thetop 160i the coverl7 may be flush withithe topiedgef of the frame and wall when the cover rests upon the interior-flange 14, the distance from thetop surface goilthe' interior flange to "the top edge 18 of thefrarne is made' equal to the thickness ofith'e cover; v i i I In the construction shown there are two gaps 1 Iner of 19 inth'e: interior flange 14, fb'ut the i such gaps may bevaried as wiiibe seen. Flush with each gap err-one side thereof is a lug: or stop; 20 projecting irorejthe lower side of theint eri'or flange. There is alisoa wedge-shaped projection 21 "on 1 the i lower side of the flange, adjacent each gap arid on the iop iosit e side'cf: gap frorn'the I stop, Imniediateiy above each gap isa rounded v1 The c ver ,17 whieh'hasthe shape of a the reyers 1 side of the notches 22; in the frame.

Whenf-the; cover is to be the frarne itfisapulle'd onto the frai ne insucha -mannerlthat-one ofthe lugs 231s broughtinto' the circular upper surface 16 ofthe cover which, because of theaoove described shape'oiithe cover,

is greater thanthe diameter of 'thef lo er surface 3Q cftheoover; is oniyslightly lessthan the interio diameter of the" oylindrical,hody iportiont 12 I V V ofthe, framegso thatthe coverlTZ-aisrather closely V fitting atthe top. Extendingifromthe lower. surj face ct. the cover-1'11 near its peripheryarethe Jugs 2?, at points whose positions .corr'espond' to k the positions of'the-gapsin'theinterioriiiange'of theffrar e. Each of these lugs has a t'radial l y- 7 extending tooth 24;, the width oiwhiohis slightly iessthanthe'width oi-the gaps.

Passing throughthecover' 17 is a radiallyinolined PassageZiwhich, irr-the embodiment i1 lustrat'ed, ntersytheg cover. near; its outer edge.

,lThepassa'ge 2 5, may ;be surrounded; on the lower gi'tudinal sectiom and'onf'thegupper sideof' the; 1 'cover by a slightly raised boss 2'7. Thus the cover,

as aiever for rotatingthefqover on its seat., -:As

explained below; it is convenient for. V the *bar 28 t to betapered; at one end In the top portionof ednotoh: 29,0f the same Width as thenrounded" will be reinforced at; the passage 2 5Qwhich; is, l adapted togreceive asuitahle bar 23' toybe used' thefoutenedge of thecover immediately opposite 1 the inclined-passage 2,5 Inay be provided a 'round-j- 0 nlacedi jh f josition on through-the gap l whic'h isgbelow said rounded 1 notch. It will be notedthat the rounded-notches i 22 faciiitate'the "placing of the c'over in the proper o t o for it Se t :inplaceguiionthe inte- 'rior flange 14. After one-cover lug; is in position-in the corresponding gap of the interior flange it. willjbe. an easy matt'er to shift the-cover so. thatthe remaining lugs henterfthei'rc-correspending gaps and-the cover settlesfin placeg;

The Dover may alsor be simply heldjcentered above the frarne,-turned unti1 the eover'notch 29v is allowed tosettle in place upon the interiorflange.

' l {Thapo'inted bar 23 mayn owhe inserted in the passage of thecove'r;andusedasaievertorotate j oppositeone of the-framenotches 22,4and then The teeth 24 proper tool. A cover of the construction de-.

scribed will be less likely to be leftoff, because the workman will not leave the cover for some-' one else to'replace when he knows that-if he a on the seat.

the bar 28 is to allow "--The construction-described insures ease of re-V been turnedfar enough The fact that there are 'asfman'y positions in -whichthe cover may be placed upon the framev as there are lugs on the lower surface of the cover contributes to the ease with wh'ich'the cover may be placed. 7 Because of the notch which has been locked or unlocked position, or whether it has being removed.' 7 1 'Moreover when the workman wishes to remove the cover he will find it a useful expedient to place the-point of'his tool in the rounded notch a counter-clockwise directionto'looserfit. --Thus the notches 'provided in the' cover an'd' frame racilitate the'removal as f well-as theplacenient 0f. h ecover.- 1 Afterthe cover has been loosened slightly the pointed bar 28 is of course inserted in the pas sage and used to rotate the cover in a-counterclockwise direction until theteeth 24 of the cover lugs come in contact with' the stops 20 'on"'the interior flange. To assist in the removal ofthe' cover one'side caIYthen-beI eaSily lifted" or: the

interior flange-by pressing down or raising up on the end of the pointed bars The pointed-end of mbval of the cover without-sticking; Even though the iron 'of thepframe' or cover may be come di'stortedlor foreign mattenmay beco'men I lodged between 'the' frame jand 'the outer: edge of v being turned on its seat because the above de scribed shapeof the coverprovides for its-periph cry to approach close to. the inner surface of inthe upper surface "of the interior flangefis'also or value for-providing clearance space between, the cover and the inner surface of the frame; 1 j 'Aft'er being locked in place the cover 'is'held' firmly to its seat at as many points as thereare lugs provided onits lower' surface." -When the co'verwill -settle'into-the groovel'5} and will no have'j'thetendency to work under the seat of the cover-which it would. have if the groove were notprovided; '--At anytime thefcover is removed; in

case much dirt is found tohav'e accumulatedin" the grovejthejpoint-of memrzs maybe used to clean it out. "Since the upperjsurfac'e of the interior-flange is in the form .of a raisedseat, with to unlock it when it is more ready insertion into provision for foreign matter to fall either off the inner edge or /the flange or off the other side of the seat into the groove, it is apparent that dirt maybe brushed off the cover seat with especial ease to provide a smooth and truesurface on which thecover may rest. Furthermore any dirt which remains upon the seat will tend to be dirt. on the seat of the man-hole cover will .of

*rcourseprevent a steady and firm seating of the cover.

:rj A" few of: the features which give simplicity;

pushed off or ground ofi when the cover is being v placed andlocked. The presence of pebbles or lightness and strength to the construction may be noted, .The interior flange 14. not only serves asa seat for the cover, but also, by virtue of the projections on its .lower side, provides means to cooperate with the te'eth on the cover lugs, to allow the'cover to be locked in position. 7 The side or each lug opposite the'tooth is made sloping and the lugs themselves are of the lightest construction consistent with the amount of strength that is requiredof them. The boss 26 on the lower side of thecover serves to strengthenthe same i againstthe action of the pointed bar 28 when it is being used asalever and is conveniently made an integral extension of one of the cover lugs 23. Iclaim as my invention:

A man'hole frame and" cover, the frame having an inwardly-projecting flange interrupted o I p e .by'aplurality of gaps at equal intervals, and the '29 of the cover and give th'eicover a. few taps in,

cover being adapted to be supported on the flange, provided with a radially-inclined passage, and

supplied :with lugsf'on its lower side at points "whose positions correspond to the positions of the gaps in the flange, each of which is equipped with a radially-extending tooth; the teeth being adapted1to-co operate with the flange to prevent slightly; unless it is first' irotated back into-its original position.

2. In a man-hole construction, a frame having its upper surface adjacent the .body portion, a

on its'lowerside near its periphery adapted to engage thelower side of the flange 'when 'the cover'is rotated slightly, a notch in the upper i U v edge of the periphery of the'cover above one of i the cover, the=co ver*wil1 not stick while Kit is I said-projections, notches in the upper edge of the frame insuch positions thatthey lie opposite' said projections when the cover has been placed upon the flange but not rotated, and means on the i s sc b e by abar for turning the cover on its seat. r a r '3. In'a'man-hole construction, a frame carrying cover supporting meansiinterrupted by gaps at regular intervals, provided with a, stop flushwith each game. and. having a wedge-shaped projection on its lower ,side'ra'djacent each gap and onthe'side of the'gap'opposite saidstop,a nd a cover adapted to be supported 'on'said means,

againstflthejlower surface of one of the wedgey d'ricalbody portion and a non-continuous,

'inwardly extendingflange/with a groove along 1% having an outwardly-inclined passage. therethrough, andjhavingaa plurality offlugs on its lowerside in positions corresponding to the .posi-. tions of the gaps in said means," each of which is equippedowith 'a tooth adapted to be wedged shaped projections on said ,means when the cover is placed thereupon and rotated slightly.

4. A frame and cover-for a man-hole aperture, said frame having wedge meansan d having tion on the flange.

an inwardly-disposed flange surmunded by an upstanding rim, with a portion rabbeted out along and adjacent to the junction between the rim and the upper surface of the flange, said rim having a substantially cylindrical inner surface perpendicular to the flange and a cover 5. A structure for a man-hole including a frame'having an inwardly disposed flange sur-. rounded by an upstanding rim having its inner surface substantially cylindrical and perpendicular to the flange, anda cover adapted to be supported wholly on the flange havingmeans on its'inner side for securing it in place when it is rotated from an unlocked position on the flange, having the diameter'of itsexposed surface only slightly less than the interior diameter of said rim, so that there is .close lateral approach to said rim at that part of the peripheral edge of the "cover that isadjacent its exposed surface, and having the remainder of its peripheraledge receding inwardly a substantial distance from said rim to give clearance between said rim and the inner parts of said peripheral edge.

r i r DANIEL C. MULVIHILL. 

